The meta-analysis showed that individuals who were physically active at the start of the study (baseline) had a significantly reduced risk of developing cognitive decline during follow-up.
The researchers explain that it is already known that physical activity has positive effects on a wide range of health measures, reducing the risk of heart disease and stroke, diabetes, obesity, hypertension and some cancers.
I think it is interesting that it is about moderate exercise:
This study did not find a clear ‘dose dependent’ effect, ie an association in which increasing levels of activity resulted in increasing levels of protection.
Lots of walking here.....
Of course there are also studies about the importance of strength training and balance